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Communication apparatus, communication system, and method and program for judging reservation acceptance




Title: Communication apparatus, communication system, and method and program for judging reservation acceptance.
Abstract: A communication apparatus of the present invention is a communication apparatus which accepts a resource reservation, and includes at least a resource reservation acceptance judging portion for accepting a resource reservation request from a communication apparatus which performs a resource reservation. The resource reservation acceptance judging portion performs acceptance of a reservation based on a resource use probability obtained from a resource reservation state and a resource use state of an own communication apparatus of at least one of the communication apparatuses which perform resource reservations. ...


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USPTO Applicaton #: #20090135776
Inventors: Toshiyuki Sashihara


The Patent Description & Claims data below is from USPTO Patent Application 20090135776, Communication apparatus, communication system, and method and program for judging reservation acceptance.

This application is based upon and claims the benefit of priority from Japanese patent application No. 2007-305202, filed on Nov. 27, 2007, the disclosure of which is incorporated herein in its entirety by reference.

BACKGROUND

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OF THE INVENTION

1. Field of the Invention

The present invention relates to an apparatus and a system for performing a reservation of a communication resource.

2. Description of Related Art

In a conventional wireless local area network (LAN), a mobile station could not reserve a resource to an access point of a handover destination in advance before performing a handover from a current access point which a mobile station is currently using to another access point. Here, a resource represents, for example, power used according to a communication rate, a memory capacity, a frequency band, or a communication rate itself. Therefore, when a handover occurs, if an access point of a handover destination cannot secure a resource necessary to maintain a communication, a handover fails.

However, due to the IEEE (The Institute of Electrical and Electronics Engineers) 802.11r standard, even in a wireless LAN, it is possible to reserve a communication resource to an access point in advance before a handover. As a result, the handover fail probability is decreased.

A handover specified in the IEEE 802.11r standard (Draft 7.0) will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a diagram illustrating a configuration of a wireless LAN system. The wireless LAN system of FIG. 1 includes a mobile station 111, a plurality of access points 101 to 107 to which the mobile station 111 have access by a wireless communication, and an authentication server 131 which performs authentication that the mobile station 111 is a mobile station authorized to access a network of a mobility domain, and the access points 101 to 107 and the authentication server 131 are connected via a wire line network.

FIG. 2 is a sequence diagram illustrating a handover sequence specified in the IEEE 802.11r standard (Draft 7.0). It is assumed that the mobile station 111 is under control of the access point 103, is communicating with the access point 103 and is moving toward the access point 104 as shown in FIG. 1. At this time, in order to reserve a resource to the access point 104 in advance, the mobile station 111 first transmits an 802.11 Authentication Request (201). The access point 104 replies an 802.11 Authentication Response to the mobile station 111 (202). After receiving the frame, the mobile station 111 transmits an 802.11 Authentication Confirm frame which contains information such as a request resource capacity such as a mean data rate, a minimum data rate and a peak data rate (203). The access point 104 replies an 802.11 Authentication ACK frame which contains an answer for representing whether to accept a resource reservation or not (204).

If a resource request of the mobile station is accepted, frame exchange for an advance reservation is finished, but if a resource request of the mobile station is not accepted, the mobile station can change a desired resource capacity and then retry to request a resource reservation to the access point 104. Thereafter, if the mobile station issues a Reassociation Request 205 till a Reassociation Deadline indicated in an Authentication ACK frame notified from an access point during a Fast BSS Transition Initial Mobility Domain Association to be performed with an access point existing when the mobile station 111 enters a mobility domain 141 for the first time, a resource reserved through the 802.11 Authentication Confirm frame 203 becomes effective, so that the mobile station 111 can communicate with the access point 104 by using the resource (e.g., see, IEEE 802.11r standard, Draft 7.0, July 2007, Section 11A 6, Pages 61 to 67). The access point 104 transmits a Reassociation Response 206 in response to the Reassociation Request 205.

In Japanese Patent Application Laid-Open (JP-A) No. 2004-266713 (pages 4 to 9), disclosed is a technique that, while performing a handover, a mobile station performs a reservation directly or through another base station to as many base stations as the number of reservation base stations determined based on a priority unique to a mobile station. If a mobile station requests a reservation directly to a base station, a mobile station individually transmits reservation information to as many base stations as the number of base stations. If another base station is used, a mobile station transmits reservation information containing the number of reservation base stations to a base station with which it is communicating, and the base station which has received the reservation information selects as many neighboring base stations as the number of reservation base stations and transmits the reservation information to them. Each base station which has received a reservation request directly from a mobile station or through another base station compares a resource capacity requested by a mobile station to its available resource capacity, and accepts a reservation if an available resource capacity is equal to or more than a request resource capacity and rejects a reservation receipt if an available resource capacity is less than a request resource capacity.

SUMMARY

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However, in a mobile communication system disclosed in JP-A No. 2004-266713 (pages 4 to 9), a base station judges whether to accept a resource reservation or not by comparing a request resource capacity of a mobile station to its available resource capacity. A mobile station hands over to a single base station among a plurality of reserved base stations, and whether to accept a reservation or not is judged by comparing an available resource capacity of a single base station to a request resource capacity. Since a resource capacity which other mobile stations can reserve or use is decreased by a resource capacity for which a reservation is made, if a certain mobile station reserves resources of a plurality of base stations, the number of mobile stations which can request a resource reservation to a base station is decreased or the number of base stations to which a mobile station can request a reservation is decreased, whereby there is a problem in that a resource reservation cannot be effectively made.

Therefore, the present invention is devised to resolve the above problems, and it is an object of the present invention to provide a communication system, a communication apparatus, a method, and a program which can efficiently make a resource reservation.

In order to achieve the above object, the present invention has the following features.

In order to achieve the above object, the present invention provides a communication apparatus which accepts a resource reservation, including: at least a resource reservation acceptance judging portion for accepting a resource reservation request from a communication apparatus which performs a resource reservation, wherein the resource reservation acceptance judging portion performs acceptance of a reservation based on a resource use probability obtained from a resource reservation state and a resource use state of an own communication apparatus of at least one of the communication apparatuses which perform resource reservations.

In order to achieve the above object, the present invention also provides a communication system, including: at least one communication apparatus which performs a resource reservation; and at least one communication apparatus which accepts a resource reservation, wherein the communication apparatus which accepts a resource reservation performs acceptance of a reservation based on a resource use probability obtained from a resource reservation state and a resource use state of an own communication apparatus of at least one of communication apparatuses which perform resource reservations.

In order to achieve the above object, the present invention also provides a method for judging acceptance of a resource reservation in a communication apparatus which accepts a reservation, including: judging acceptance of a reservation based on a resource use probability obtained from a resource reservation state and a resource use state of an own communication apparatus of a communication apparatus which performs a resource reservation.

In order to achieve the above object, the present invention also provides a method for judging acceptance of a reservation in a communication system which includes at least one communication apparatus which performs a resource reservation, and at least one communication apparatus which accepts a resource reservation, the method comprising: judging acceptance of a reservation based on a resource use probability obtained from a resource reservation state and a resource use state of an own communication apparatus of a communication apparatus which performs a resource reservation.

In order to achieve the above object, the present invention also provides a program for executing processing in an information processing apparatus, including: executing reservation acceptance processing of a resource of a communication apparatus which accepts a reservation, based on a resource use probability obtained from a resource reservation state and a resource use state of an own communication apparatus of a communication apparatus which performs a resource reservation to the information processing apparatus.

BRIEF DESCRIPTION OF THE DRAWINGS

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FIG. 1 is a diagram illustrating a configuration of a wireless LAN system;

FIG. 2 is a sequence diagram of a handover specified in the IEEE 802.11r standard (Draft 7.0);

FIG. 3 is a block diagram illustrating a structure of the access points 101 to 107 according to a first exemplary embodiment of the present invention;

FIG. 4 shows one example of a resource management table stored in a resource management database 313 according to the first exemplary embodiment of the present invention;

FIG. 5 shows one example of a resource reservation/use history table stored in a resource reservation/use history database 314 according to the first exemplary embodiment of the present invention;

FIG. 6 is a flowchart illustrating an operation of a resource reservation acceptance judging means 311 according to the first exemplary embodiment of the present invention;

FIG. 7 is a flowchart illustrating an operation of resource reservation/use history database probability acquisition processing in the resource reservation acceptance judging means 311 according to the first exemplary embodiment of the present invention;

FIG. 8 is a flowchart illustrating an operation of resource reservation/use history table update processing in the resource reservation acceptance judging means 311 according to the first exemplary embodiment of the present invention;

FIG. 9 is a flowchart illustrating an operation of a resource management means 312 according to the first exemplary embodiment of the present invention;

FIG. 10 is a flowchart illustrating an operation of the resource reservation acceptance judging means 311 according to a second exemplary embodiment of the present invention;

FIG. 11 shows one example of a resource reservation acceptance probability table according to the second exemplary embodiment of the present invention;

FIG. 12 is a flowchart illustrating an operation of the resource reservation acceptance judging means 311 according to a third exemplary embodiment of the present invention;

FIG. 13 is a flowchart illustrating one example of use resource computation processing according to the third exemplary embodiment of the present invention;




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stats Patent Info
Application #
US 20090135776 A1
Publish Date
05/28/2009
Document #
File Date
12/31/1969
USPTO Class
Other USPTO Classes
International Class
/
Drawings
0


Resource Reservation

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20090528|20090135776|communication apparatus, communication system, and method and program for judging reservation acceptance|A communication apparatus of the present invention is a communication apparatus which accepts a resource reservation, and includes at least a resource reservation acceptance judging portion for accepting a resource reservation request from a communication apparatus which performs a resource reservation. The resource reservation acceptance judging portion performs acceptance of |Nec-Corporation
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